Repair grass clippers by tightening the pivot nut and oiling them. If they have become dull due to use, remove the pivot nut and use a scissor sharpener to sharpen the blades. Attach a piece of 300-grit sandpaper to a flat surface with duct tape, and use it to remove any burrs from the back of the blades. Because the clippers are used close to the dirt, they quickly become dirty and dull and require frequent cleaning and sharpening.
Hedge clippers that are not cutting as they should require a similar treatment. However, if they have become dull, sharpen them with a file, following the angle the manufacturer establishes when making the cutting tools. Follow up with the sandpaper treatment. Hedge clippers are for cutting stems up to 3/8-inch in diameter. Avoid cutting larger branches as they can bend the blades.
Pruning shears are powerful cutting tools designed for branches of sizes up to an inch or larger. They have a rounded cutting blade and a curved blunt blade. If they are not working correctly, sharpening the blade is helpful, although difficult. Maintain the same curve on the cutting blade, and keep the sides and top of the blunt blade flat and square. Use a half-round file to maintain the correct angle.